The Prince of Wales talks to nurses as he leaves after meeting paramedics and support staff who assisted those injured in the terrorist incident in Westminster at King’s College Hospital in south London

The royal also met Travis Frain, a student who was injured in the attack.

The history and politics student wrote: “Just a quick update guys. Massive thanks to @KingsCollegeNHS and to @ClarenceHouse for visiting today. #londonattack.”

Charles met consultant radiologist Pauline Kane who was working on Wednesday when victims of the attack were brought to the hospital.

After chatting to Charles, she said they dealt with a series of typical blunt trauma injuries “one after the other”, almost as though it was a “conveyor belt of organised, structured, really efficient medical care”.

Ms Kane said: “I was really proud of the way this hospital responded.”

She added: “It was inspiring the way people just worked together and communicated to deal with the patient in front of them.

“It didn’t matter how many would be coming, you knew you would just keep working. It was, it was really quite something.”

He spoke of the three innocent people who were killed during the “truly terrible” incident, that many more were gravely injured and that “all of us have been deeply affected by what has happened”.

To gentle applause he said: “This cannot be undone, much as we would wish it. However we do get to choose our reaction and gathering here tonight shows exactly how we must move forward. We must stand together.

“People have tried to tear this city apart with acts of terror many times before. They have never succeeded and they never will.”

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